EP0052310B1 - Dispositif de mise sous tension d'une chenille, en particulier pour un tracteur chenillé - Google Patents

Dispositif de mise sous tension d'une chenille, en particulier pour un tracteur chenillé Download PDF

Info

Publication number
EP0052310B1
EP0052310B1 EP81109519A EP81109519A EP0052310B1 EP 0052310 B1 EP0052310 B1 EP 0052310B1 EP 81109519 A EP81109519 A EP 81109519A EP 81109519 A EP81109519 A EP 81109519A EP 0052310 B1 EP0052310 B1 EP 0052310B1
Authority
EP
European Patent Office
Prior art keywords
track
cylinder
preload
tension spring
flange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81109519A
Other languages
German (de)
English (en)
Other versions
EP0052310A1 (fr
Inventor
Danny Lee Ragon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deere and Co
Original Assignee
Deere and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Publication of EP0052310A1 publication Critical patent/EP0052310A1/fr
Application granted granted Critical
Publication of EP0052310B1 publication Critical patent/EP0052310B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/30—Track-tensioning means

Definitions

  • US-A-3 332 725 discloses a crawler belt tensioning device of a comparable type provided in a caterpillar tractor.
  • the tension spring is supported on the one hand on a spring abutment and on the other hand on a flange of a guide part inserted into the tension spring, which is sleeve-shaped and in which a piston is fixedly arranged, but a cylinder assigned to this piston is guided in a longitudinally displaceable manner.
  • the end of the cylinder facing away from the piston is closed by a head part which has the filling and drainage device mentioned above.
  • the invention is based on the object of making the device explained at the outset safer in terms of its handling.
  • a disadvantage of this design is the need to manipulate the cap screws to retighten the clamping bush. This manipulation is also dangerous because it is in the range of the track adjuster.
  • Another disadvantage is the fact that both the piston and the cylinder can rotate, so that the optimal allocation of the grease nipple or the grease channels is not always guaranteed.
  • each pretensioning spacers each have a handle that lies above the displacement path of the caterpillar adjuster.
  • each preload spacer can also have two finger engagement bores extending vertically downward from the top.
  • each caterpillar alignment guide has an upper flange, which covers the guide groove upwards, in each of which an insertion opening corresponding to the outer contour of the above-mentioned sliding pieces is arranged, at a point whose distance from the above-mentioned spring abutment at least corresponds to the length of the relaxed tension spring.
  • the tension spring can thus be installed in the untensioned position; immediately after compression of the tension spring begins, the sliders of the flange of the caterpillar alignment housing are also positively guided from above, so that the caterpillar adjuster does not break out upwards.
  • the stop of the caterpillar frame is designed in the form of an inverted U and is releasably attached to a cross frame which is firmly connected to two side rails which also form the caterpillar alignment guides. This makes it possible to carry out the compression of the tension spring with a separate tensioning device which is inserted between the said cross frame and the head part of the cylinder after the stop has been removed.
  • FIG. 1 shows a crawler tractor 10 in which the present invention can be applied.
  • This caterpillar tractor essentially comprises a main frame 12 which is essentially supported by a right and a left track arrangement 14 (not shown in the drawing).
  • the drive of the crawler tractor is accommodated in a machine housing 16 in the front area of the main frame 12, while a driver's cabin 18 is arranged in the rear area thereof.
  • the right and left caterpillar tracks arrangement 14 correspond, only the right arrangement is explained in more detail below. It comprises a caterpillar frame 20 which extends in the longitudinal direction and has inner and outer side rails 22, 24 which are spaced apart and parallel to one another.
  • the caterpillar frame 20 lies within an endlessly revolving caterpillar chain 26 which is guided around a drive sprocket 28 carried by the main frame 20 and around a stator wheel 29 which is arranged between the side rails 22, 24 and is mounted thereon in such a way that it can be moved back and forth can.
  • a caterpillar tensioning device 30 serves to press the idler wheel 29 resiliently against the caterpillar track 26 in order to maintain a desired caterpillar track tension, and also enables the passage of interfering bodies between the drive sprocket 28 and the caterpillar track 26.
  • This caterpillar tensioning device 30 is in shape a compressible spreader formed, since the individual parts are arranged in a row behind and next to each other.
  • the caterpillar tensioning device essentially comprises a tension spring 32, a caterpillar track adjuster 34, a slide rod 36 and a stator yoke 38.
  • the tension spring 32 is supported with its rear end on a spring abutment 40 which is fastened centrally between the two side rails 22, 24 on a frame part 42, which in turn the connects the two side rails mentioned.
  • the caterpillar adjuster 34 comprises a cylindrical, sleeve-shaped caterpillar adjuster housing 44, which is inserted into the forward end of the tension spring 32 and bears with a flange 46 on this spring end.
  • the tension spring is supported at its rear end by the spring abutment 40 projecting into it and at its other end by the caterpillar adjustment housing 44, which for this purpose has on its flange 46 opposing sliders 48, 50 which engage in guide grooves of caterpillar adjustment guides 52, 54 which are fastened to the side rails 22, 24 and each have an upper flange 56, 58 covering the guide groove upwards.
  • the sliders 48, 50 corresponding insertion opening 60, 62 is arranged at a point whose distance from the spring abutment 40 corresponds to the length of the relaxed tension spring 32 plus the thickness of the flange 46.
  • the sliders of the flange 46 are inserted from above into the insertion openings 60, 62 in order to engage under the upper flanges 56, 58 of the track adjustment guide 52, 54 after a first slight displacement of the flange 48. This prevents the tension spring from breaking out of this sliding guide.
  • the caterpillar alignment housing 44 is moved backwards by a hydraulic tensioning device.
  • the latter comprises a piston 64, which is arranged centrally in the caterpillar alignment housing 44 and engages with an end part 66 of reduced diameter in a piston centering opening 68 of a partition 70 of the caterpillar alignment housing.
  • the hydraulic tensioning device comprises a cylinder 72 which is slidably mounted in the front end of the caterpillar adjustment housing 44, is guided with its open rear end slidably on the piston 64 and is closed at its front end via a head part 74.
  • the latter has a vertical grease filling bore 76 provided with a screw-in thread, which opens into a lubrication channel 78, which in turn opens into a cylinder space 80 which is delimited by the piston and the cylinder head part.
  • a grease nipple 82 is screwed into the grease filling bore 76, so that grease can be pressed into said cylinder space 80 using a conventional grease gun.
  • a drain channel 84 opens into the grease container bore 76, the other end of which leads to the surface of the head part 74.
  • a stop 86 designed in the form of an inverted U is detachably fastened, which is arranged in alignment in front of the head part 74 of the cylinder and engages around the sliding rod 36. The latter is inserted with its rear end into a recess 87 in the head part 74 and with its front end into a recess of the stator yoke 38.
  • the two ends of the displacement rod 36 are provided with flats 88, 89 which rest on roller journals 90, 91, which in turn are arranged transversely in the above-mentioned recesses of the stator wheel yoke or the cylinder head part and a rotation of the shift rod 36 relative to the stator wheel yoke 38 or prevent rotation of the cylinder 72 relative to the slide rod 36.
  • roller journals 90, 91, 38 counter surfaces can be arranged in the recess 87 of the head part and in the recess of the stator yoke, which abut the flats 88, 89.
  • the distance of the stop 86 from the insertion openings 60, 62 is somewhat larger than the thickness of the cylinder head part 74 measured in the longitudinal direction.
  • the tension spring 32 can be installed in the caterpillar frame 20 in a completely relaxed manner, in which piston 64 and cylinder 72 are first in the caterpillar adjustment housing 44 used and the latter can then be inserted into the front end of the tension spring 32. Then the rear end of the tension spring 32 is then pushed onto the spring abutment 40; the sliders 48, 50 of the housing flange 46 are lowered from above into the insertion openings 60, 62. The flange 46 then has the position shown in broken lines in FIG. 4; the cylinder head part 74 lies close to or directly against the stop 86, as shown in solid lines in FIG.
  • the tension spring 32 can then be pretensioned into its working position, either with the aid of a grease gun, with which the grease is pressed into the cylinder space 80 via the grease nipple 82, or with the aid of another suitable pressing device which, after the stop 86 has been removed, between the cross frame 85 and the cylinder head part 74 can be used.
  • a grease gun When a grease gun is used, the grease pressed into the cylinder space 80 acts on the piston 64, whereupon the cylinder head part 74 will first make contact with the stop 86, only then to push the caterpillar adjustment housing 44 backwards and thus to compress the tension spring 32 into the desired position.
  • the caterpillar adjuster 34 could not expand in order to compensate for an elongation of the caterpillar chain 26, which can occur, for example, due to wear. Therefore, means must be provided to lock the preloaded tension spring 32 in the preloaded position while the cylinder head part 74 is on Beat 86 is withdrawn and brought into the position shown in Figure 3, which corresponds approximately to the position when using a new track.
  • the caterpillar alignment guides 52, 54 have stop surfaces 92, 94 which lie in the displacement path of the flange 46.
  • a first preload spacer 96 rests with its front end face against the abovementioned stop surface 92 and is held in position by screw bolts 98 which are inserted through the inner caterpillar adjustment guide 52 and are screwed into threaded holes in the preload spacer.
  • a second prestressing spacer 100 rests with its front end face against the stop face 94 and is held in this position by screw bolts 102.
  • the preload spacers 96, 100 are inserted after the crawler adjuster 34 has been actuated to compress the spring 32 somewhat beyond its normal working position. By unscrewing the lubrication nipple 82, grease is then drained from the cylinder space 80 through the lubrication channel 78 and the drain channel 84.
  • the flange 46 moves forward until it abuts against the preload spacers 96, 100 and thus takes the pressure previously acting on the cylinder space 80.
  • the preload force of the spring can be varied by selecting preload spacers of different lengths.
  • the preload spacers 96, 100 have recesses 104, 106 extending in the longitudinal direction on both sides in the upper part of the preload spacers, which form a handle and thus enable the installation and removal of these parts without the hands in the sliding area of the flange 46 have to bring.
  • FIG. 7 shows a modified embodiment for a preload spacer 108.
  • two finger engagement bores 110, 112 which extend vertically downward from the top, are provided, which likewise allow handling of the preload spacers without coming into the danger area formed by the displacement path of the flange 46.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Soil Working Implements (AREA)

Claims (6)

1. Dispositif (30) de mise en tension des chenilles, en particulier pour tracteur à chenilles (10), constitué par un châssis de chenille (20) à l'extrémité avant duquel est monté de façon déplaçable une roue avant (29) et à l'extrémité arrière duquel est monté à poste fixe une portée de ressort (40) alignée avec la roue avant, cette roue avant prenant appui sur cette portée de ressort par l'intermédiaire d'une béquille télescopique comprenant un ressort de mise en tension (32), un dispositif (34) de réglage de la chenille, une barre coulissante (36) et une chape (38) recevant la roue avant, ces éléments étant disposés successivement l'un derrière l'autre en rangée, et présentant en outre les particularités suivantes :
- le ressort de mise en tension (32) prend appui, d'une part, sur la portée de ressort (40) et, d'autre part, sur la bride (46) d'un organe de guidage (44) engagé dans le ressort de mise en tension ;
- un piston (64) est guidé de façon coulissante dans un cylindre (72), ce piston pouvant être soumis à l'action d'un liquide, d'une graisse ou d'un moyen analogue qui est introduit sélectivement dans la chambre (80) du cylindre par un dispositif de remplissage (76, 78, 82) ou bien qui peut être évacué hors de cette chambre par un dispositif d'évacuation (82, 84) ;
- parmi la combinaison cylindre-piston (72, 64) l'un des éléments (64) s'applique contre l'organe de guidage (44), tandis que l'autre élément (72) s'applique contre une extrémité de la barre coulissante (36) ;
- lors du remplissage de la chambre (80) du cylindre pour établir une précontrainte dans le ressort de mise en tension (32), l'autre élément (72) de la combinaison cylindre-piston (72, 64) s'applique contre une butée (86) du châssis (20) de la chenille ;
- des organes de précontrainte (96, 100, 108) pouvant être actionnés à la main verrouillent le ressort de mise en tension (32) dans sa condition de précontrainte et permettent l'évacuation de la pression à partir de la chambre (80) du cylindre tout en entretenant la précontrainte : caractérisé par les particularités suivantes :
a) l'organe de guidage est constitué par un carter en forme de douille (44) de réglage de la chenille, dans lequel le piston précité (64) est monté à poste fixe, le cylindre précité (72) étant guidé dans ce carter de façon à pouvoir coulisser longitudinalement ;
b) l'extrémité du cylindre (72) opposée au piston (64) est obturée par une culasse (74) qui comporte le dispositif de remplissage et d'évacuation précité (76-84) et qui s'applique contre la butée précitée (86) lorsqu'une précontrainte est exercée sur le ressort ;
c) la bride (46) du carter (44) de réglage de la chenille comporte des coulisseaux opposés (48, 50) qui s'engagent dans des rainures de guidage de guides (52, 54) de réglage de la chenille, ces guides étant disposés de part et d'autre du carter de réglage de la chenille et étant parallèles à celui-ci ;
d) les organes précités de précontrainte du ressort sont formés par une paire de cales de précontrainte (96, 100, 108) qui sont fixés amoviblement sur les guides (52, 54) de réglage de la chenille dans la trajectoire de déplacement en translation de la bride précitée (46) et qui constituent une butée pour cette bride.
2. Dispositif suivant la revendication 1, caractérisé en ce que chaque guide (52, 54) de réglage de la chenille présente une surface de butée (92, 94) orientée vers le ressort de mise en tension (32), les cales de précontrainte (96, 100, 108) étant entourées des deux côtés par cette surface de butée ainsi que par la bride (46).
3. Dispositif suivant la revendication 1 ou 2, caractérisé en ce que chaque guide (52, 54) de réglage de la chenille présente une aile supérieure (56, 58) recouvrant la rainure de guidage vers le haut et dans laquelle est ménagé chaque fois un orifice d'introduction (60, 62) correspondant au contour extérieur des coulisseaux précités (48, 50), plus spécialement en un point dont la distance à la portée de ressort précitée (40) correspond au moins à la longueur du ressort de mise en tension (32) à l'état détendu.
4. Dispositif suivant la revendication 1, 2 ou 3, caractérisé en ce que la butée (86) du châssis de chenille (20) a une forme en U inversé et est fixée amoviblement sur un châssis ou cadre transversal (85) qui est relié rigidement à deux profilés latéraux (22, 24) formant également les guides (52, 54) de réglage de la chenille.
5. Dispositif suivant l'une quelconque des revendications précédentes, caractérisé en ce que les cales de précontraintre (96, 100) présentent chacune une poignée (104,106) qui se trouve au-dessus de la trajectoire de coulissement ou de translation du dispositif (34) de réglage de la chenille.
6. Dispositif suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que chaque cale (108) comporte deux perçages (110, 112) d'engagement des doigts, s'étendant verticalement vers le bas depuis sa face supérieure.
EP81109519A 1980-11-17 1981-11-05 Dispositif de mise sous tension d'une chenille, en particulier pour un tracteur chenillé Expired EP0052310B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/207,167 US4413862A (en) 1980-11-17 1980-11-17 Track recoil system
US207167 1998-12-07

Publications (2)

Publication Number Publication Date
EP0052310A1 EP0052310A1 (fr) 1982-05-26
EP0052310B1 true EP0052310B1 (fr) 1985-05-15

Family

ID=22769455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109519A Expired EP0052310B1 (fr) 1980-11-17 1981-11-05 Dispositif de mise sous tension d'une chenille, en particulier pour un tracteur chenillé

Country Status (6)

Country Link
US (1) US4413862A (fr)
EP (1) EP0052310B1 (fr)
JP (1) JPS57114766A (fr)
AU (1) AU539604B2 (fr)
CA (1) CA1167491A (fr)
DE (1) DE3170540D1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4650259A (en) * 1985-11-12 1987-03-17 Caterpillar Inc. Method and apparatus for tensioning ground engaging endless elastomeric belts
US4854650A (en) * 1988-04-04 1989-08-08 Caterpillar Inc. Track recoil and tensioning mechanism
US4881786A (en) * 1988-07-21 1989-11-21 Caterpillar Inc. Tensioning and recoil system for a tracked vehicle
US5254047A (en) * 1991-11-12 1993-10-19 Joy Technologies Inc. Chain take-up apparatus
US5409305A (en) * 1992-08-17 1995-04-25 Deere & Company Undercarriage for a track laying vehicle
DE4330833A1 (de) * 1993-07-16 1995-03-23 Intertractor Ag Vorrichtung zum Spannen und Abfedern des Leitrades von Kettenfahrzeugen
DE4323912A1 (de) * 1993-07-16 1995-01-19 Intertractor Ag Vorrichtung zum Spannen und Abfedern des Leitrades von Kettenfahrzeugen
DE59909503D1 (de) 1998-04-22 2004-06-24 Intertractor Gmbh Fahrschiff für Raupenfahrzeuge
US6322171B1 (en) * 2000-02-04 2001-11-27 Clark Equipment Company Track tensioning assembly
JP4414602B2 (ja) * 2001-02-22 2010-02-10 株式会社小松製作所 トラックフレーム構造
US7229140B2 (en) * 2004-04-01 2007-06-12 Clark Equipment Company Pre-tensioned spring track tensioning system
US7226137B2 (en) * 2004-11-10 2007-06-05 Clark Equipment Company Stop pin for track tension assembly
CA2722973C (fr) * 2008-05-05 2016-03-15 Clark Equipment Company Systeme modulaire de mise en tension de chenilles
DE102010031834A1 (de) 2010-07-22 2012-01-26 Liebherr-Werk Nenzing Gmbh Kettenlaufwerk und Arbeitsmaschine
EP2428436B1 (fr) * 2010-09-14 2014-11-05 Joseph Vögele AG Train de roulement à chenilles
US9016809B2 (en) * 2012-12-14 2015-04-28 Caterpillar Global Mining Llc Track shoe and pin removal system
US11345420B2 (en) 2019-08-06 2022-05-31 Deere & Company Undercarriage assembly for a work machine and method of use

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1865087A (en) * 1929-11-11 1932-06-28 Koehring Co Multiplane adjusting and adjustment securing means
US3008772A (en) * 1959-01-05 1961-11-14 Sr Joseph C Helsel Track tension adjuster
DE1228217B (de) * 1964-12-04 1966-11-10 Ver Baeckereimaschinenwerke Ve Schaftspannvorrichtung insbesondere fuer Ruehr- und Schlagmaschinen
US3332725A (en) * 1965-10-04 1967-07-25 Caterpillar Tractor Co Recoil and suspension mechanism for track-type tractors
US3779615A (en) * 1972-04-10 1973-12-18 Caterpillar Tractor Co Mounting device for rotatable members
US3829172A (en) * 1972-12-11 1974-08-13 Caterpillar Tractor Co Recoil mechanism for track-type tractors
US3980351A (en) * 1975-01-02 1976-09-14 Fiat-Allis Construction Machinery, Inc. Track idler recoil spring assembly and method for installation and removal
US4018295A (en) * 1975-11-14 1977-04-19 Caterpillar Tractor Co. Vehicle equalizer bar mounting means
US4088377A (en) * 1976-02-06 1978-05-09 Caterpillar Tractor Co. Recoil spring lock device
US4223878A (en) * 1977-07-07 1980-09-23 Caterpillar Tractor Co. Modular recoil mechanism
FR2426389A2 (fr) * 1978-05-24 1979-12-21 Clement Bayard Sa Anc Ets Moyeu universel pour appareils de culture a moteur
US4283093A (en) * 1978-10-23 1981-08-11 Caterpillar Tractor Co. Track adjuster and guard

Also Published As

Publication number Publication date
DE3170540D1 (en) 1985-06-20
CA1167491A (fr) 1984-05-15
EP0052310A1 (fr) 1982-05-26
JPS57114766A (en) 1982-07-16
US4413862A (en) 1983-11-08
AU7618281A (en) 1982-05-27
AU539604B2 (en) 1984-10-04

Similar Documents

Publication Publication Date Title
EP0052310B1 (fr) Dispositif de mise sous tension d'une chenille, en particulier pour un tracteur chenillé
DE3723494C2 (de) Spannvorrichtung
DE1946651C3 (de) Spanner für endlose Zugmittel, insbesondere für Ketten
EP0195945A1 (fr) Tendeur de chaîne
DE3136440A1 (de) Spannvorrichtung zum spannen von werkzeugen
EP0060498B1 (fr) Appareil pour l'assemblage bout à bout de deux tiges de renforcement au moyen d'un manchon d'accouplement
DE2937972A1 (de) Vorrichtung zum aufbringen einer flaechenpressung auf fortschreitende werkstuecke
EP1813392B1 (fr) Oultil de mise en place d'un joint torique dans une gorge d'un dispositif de projection de jet
DE1920311U (de) Vorrichtung fur fahrzeug mit hydraulischen bremsen zur veranderung der bremskraft auf die fahrzeugraeder in abhangigkeit von der radlast.
DE69109693T2 (de) Montage-grundkörper für führungsschienen.
DE3436075C1 (de) Vorrichtung zur Ioesbaren Verbindung von Greiferschienenteilen der Greiferschienen in einer Transfer-Presse
DE3225853A1 (de) Werzeug zum verbinden von rohren
DE7926084U1 (de) Saegebandfuehrung fuer bandsaegemaschinen
DE102017121641A1 (de) Riemenspanner für Längsförderer
DE2853050C2 (de) Seitliche Abdichtungsvorrichtung für einen Ausbaurahmen im untertägigen Bergbau
DE1630567B2 (de) Kettenspannvorrichtung fuer gleiskettenfahrzeuge
DE2539019C2 (de) Kettenspannvorrichtung für Gleiskettenfahrzeuge
DE69404666T2 (de) Schraubenschlüssel
DE2647832B2 (de) Druckmittelbetätigtes Spannwerkzeug mit manuell zustellbarem Spannblock
DE2622886C3 (de) Führungseinrichtung für ein Schildausbaugestell
DE3803397C2 (fr)
DE3245210C2 (de) Filterpresse
DE69903341T2 (de) Unterboden mitspurweitenänderung
DE2512844C3 (de) Strangpresse für stangenförmiges Preßgut
DE2631598A1 (de) Stoesselfuehrung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT

ITCL It: translation for ep claims filed

Representative=s name: LENZI & C.

17P Request for examination filed

Effective date: 19821118

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 3170540

Country of ref document: DE

Date of ref document: 19850620

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19880729

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19880802

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881118